serial: earlycon: add DT support

This adds the infrastructure to generic earlycon for earlycon setup
using DT. The actual setup is not enabled until a following commit to
add the FDT parsing.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@linaro.org>

3 files changed, 37 insertions, 1 deletions

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index c92e83088adb..5131b5ee6164 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -15,6 +15,8 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/serial_core.h>
+#include <linux/sizes.h>
+#include <linux/mod_devicetable.h>
 
 #ifdef CONFIG_FIX_EARLYCON_MEM
 #include <asm/fixmap.h>
@@ -32,6 +34,9 @@ static struct earlycon_device early_console_dev = {
         .con = &early_con,
 };
 
+static const struct of_device_id __earlycon_of_table_sentinel
+        __used __section(__earlycon_of_table_end);
+
 static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
 {
         void __iomem *base;
@@ -142,3 +147,26 @@ int __init setup_earlycon(char *buf, const char *match,
         register_console(early_console_dev.con);
         return 0;
 }
+
+int __init of_setup_earlycon(unsigned long addr,
+                             int (*setup)(struct earlycon_device *, const char *))
+{
+        int err;
+        struct uart_port *port = &early_console_dev.port;
+
+        port->iotype = UPIO_MEM;
+        port->mapbase = addr;
+        port->uartclk = BASE_BAUD * 16;
+        port->membase = earlycon_map(addr, SZ_4K);
+
+        early_console_dev.con->data = &early_console_dev;
+        err = setup(&early_console_dev, NULL);
+        if (err < 0)
+                return err;
+        if (!early_console_dev.con->write)
+                return -ENODEV;
+
+
+        register_console(early_console_dev.con);
+        return 0;
+}
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index b9404f6590f1..d647637cd699 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -155,6 +155,7 @@
 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
+#define EARLYCON_OF_TABLES()    OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
 
 #define KERNEL_DTB()                                                    \
         STRUCT_ALIGN();                                                 \
@@ -483,7 +484,8 @@
         CLKSRC_OF_TABLES()                                              \
         CPU_METHOD_OF_TABLES()                                          \
         KERNEL_DTB()                                                    \
-        IRQCHIP_OF_MATCH_TABLE()
+        IRQCHIP_OF_MATCH_TABLE()                                        \
+        EARLYCON_OF_TABLES()
 
 #define INIT_TEXT                                                       \
         *(.init.text)                                                   \
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 7a15b5b24c0b..5bbb809ee197 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -294,6 +294,9 @@ struct earlycon_device {
 int setup_earlycon(char *buf, const char *match,
                    int (*setup)(struct earlycon_device *, const char *));
 
+extern int of_setup_earlycon(unsigned long addr,
+                             int (*setup)(struct earlycon_device *, const char *));
+
 #define EARLYCON_DECLARE(name, func) \
 static int __init name ## _setup_earlycon(char *buf) \
 { \
@@ -301,6 +304,9 @@ static int __init name ## _setup_earlycon(char *buf) \
 } \
 early_param("earlycon", name ## _setup_earlycon);
 
+#define OF_EARLYCON_DECLARE(name, compat, fn)                           \
+        _OF_DECLARE(earlycon, name, compat, fn, void *)
+
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
                                    struct console *c);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,